]> GH barcode-01919205 United States of America Virginia Brent Marsh along Potomac River east of Co. rt 633, S of Co. rt 611 & N of Co. rt 658. N of Aquia Creek Heteranthera dubia MacMillan MacMillan 2020-10-30 13:13:47 C. N. Horn, M. T. Strong, & C. L. Kelloff